MP6302
Energy Storage and Release
Control IC
The Future of Analog IC Technology
DESCRIPTION
The MP6302 is an energy storage and release
controller. It charges storage capacitor from
input during normal operation. Once the storage
capacitor is charged to the selected voltage, the
charge is stopped, and the storage capacitor is
separated from the input. The charging circuit
maintains the storage voltage after the charge
is completed.
The MP6302 keeps monitoring the input voltage,
and releases the charge from storage capacitor
to the input capacitor when the input voltage is
lower than a selected release voltage. It
regulates the input voltage close to release
voltage for as long as possible.
The MP6302 has built-in current limit circuit
during the charging of the storage capacitor.
The storage and release voltage can be
programmed to user desired value by external
resistors.
FEATURES
•
•
•
•
•
•
Wide 4.2V to 18V input operating range
2.5A dumping current from storage to Vin
Built-in 250mA current limit for charging
storage capacitor
User programmable storage and release
voltage
Indicators for storage and input voltage
Available in a 2mmx3mm QFN10 package
APPLICATIONS
•
•
Hard Disk Drives
Solid State Drives
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP6302 comes in a tiny 2mmx3mm QFN10
package and requires a minimum number of
readily available standard external components.
TYPICAL APPLICATION
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
1
MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
ORDERING INFORMATION
Part Number*
MP6302DD
Package
QFN10 (2x3mm)
Top Marking
ABC
Free Air Temperature (TA)
-40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP6302DD–Z);
PACKAGE REFERENCE
TOP VIEW
VMAX
1
10 BST
STRG
2
9 VIN
PGIN
3
8 FB2
FB1
4
7 PGS
GND
5
6
NC
QFN10 (2x3mm)
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
VIN ................................................ -0.3V to 22V
VBST................................................ -0.3V to 40V
VBST-VIN………………………………-0.3V to 25V
VMAX ............................................... -0.3V to 42V
VMAX-VIN………………………….......-0.3V to 25V
VSTRG .............................................. -0.3V to 32V
VSTRG-VIN……………………………..-0.3V to 25V
VPG, VGASP ...................................... -0.3V to 22V
All Other Pins ................................ -0.3V to 6.5V
Junction Temperature .............................. 150°C
Lead Temperature ................................... 260°C
(2)
Continuous Power Dissipation (TA = +25°C)
..................................................................1.2W
Junction Temperature .............................. 150°C
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
θJA
θJC
QFN10 (2x3mm) .................... 70 ...... 15 ... °C/W
Recommended Operating Conditions (3)
Supply Voltage VIN .......................... 4.5V to 18V
Storage Voltage VSTRG ..... VIN to 2xVIN(32V max)
Maximum Junction Temp (TJ) ................ +125°C
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
2
MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
ELECTRICAL CHARACTERISTICS (5)
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol
Input Supply Voltage Range
Supply Current (Shutdown)
Supply Current (Quiescent)
VIN Under Voltage Lockout
Threshold Rising
VIN Under Voltage Lockout
Threshold Hysteresis
Feedback Voltage
VIN
Is
Iq
Min
VEN = 0V
VEN = 2V, VFB = 1.1V
3.0
VFB1_L
Vstorage Refresh ThresholdHysteresis
VFB1_Hys
V
μA
μA
3.5
4.0
V
0.97
1
mV
1.03
VFB+0.025 VFB+0.05
VFB-0.05 VFB-0.025
V
V
V
50
mV
VFB1= VFB2=1V
10
0.9
0.85
25
VPGS
Sink 4mA
0.2
V
IPGS LEAK
VTHPGIN
VTLPGIN
VPGS=3.3V
10
1.05
1
nA
VFB2
VFB2
2
μs
Sink 4mA
0.2
V
VPGIN=3.3V
10
nA
Input Inrush Current Limit for
V =12V, Charging
IPRECHARGE_LIMIT IN
Charging Storage Capacitor
CSTORAGE from 0 to VIN
0.25
A
Current limit for Dumping
Charge from CSTORAGE to VIN
IDUMP_LIMIT
2.5
Thermal Shutdown
Thermal Shutdown Hysteresis
TSD
THYS
150
30
PGIN Delay
IFB
VTHPGS
VTLPGS
PGS.Td
Units
18
350
VFB1, VFB2
Vstorage Refresh ThresholdLow
Max
1
250
INUVHYS
VFB1_H
Typ
4.2
INUVVth
Vstorage Refresh ThresholdHigh
Feedback Current
PGS High Threshold
PGS Low Threshold
PGS Delay
PGS Sink Current
Capability
PGS Leakage Current
PGIN High Threshold
PGIN Low Threshold
Condition
PGIN.Td
PGIN Sink Current
Capability
PGIN Leakage Current
VPGIN
IPGIN_LEAK
50
4
nA
VFB1
VFB1
μs
A
ºC
ºC
Note:
5) Guaranteed by design.
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
3
MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VSTORAGE = 8.5V, VRELEASE=4.2V, For DCDC Converter: POUT=0.3W, VOUT=1.8V, TA = +25ºC,
unless otherwise noted.
Release Time vs.
Storage Capacitance
Thermal Performance
12
POUT=0.15W
250
200
150
POUT=0.3W
100
POUT=1W
50
0
0
500
1000 1500 2000 2500
10
POWER LOSS (W)
RELEASE TIME (mS)
300
8
6
4
2
0
0.0001 0.001
0.01
0.1
1
10
MAXIMUM HOLD UP TIME (S)
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VSTORAGE = 8.5V, VRELEASE=4.2V, For DCDC Converter: POUT=0.3W, VOUT=1.8V, TA = +25ºC,
unless otherwise noted.
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
PIN FUNCTIONS
QFN2x3
Pin #
Name
Description
1
VMAX
Internal Supply. A 2.2nF ceramic capacitor is required for decoupling. Place this
capacitor as close to the pin as possible.
2
3
4
STRG Connect to storage capacitor for energy storage and release operation.
PGIN Open drain output to indicate input power availability.
FB1 Feedback to set storage voltage.
System Ground. This pin is the reference ground of the regulated output voltage. For
GND
this reason care must be taken in PCB layout.
N/C
The pin should not be connected.
PGs Open drain output to indicate storage voltage availability.
FB2 Feedback to set release voltage.
Supply Voltage. The MP6302 operates from a +4.2V to +18V input rail. Input decoupling
VIN
capacitor is needed to decouple the input rail.
Bootstrap. A capacitor and a resistor in series connected between this pin and DC/DC
BST
converter’s SW node is required to charge storage capacitor.
5
6
7
8
9
10
MP6302 Rev. 1.02
7/17/2015
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© 2015 MPS. All Rights Reserved.
6
MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
OPERATION
The MP6302 is an energy storage and release
control IC. It charges the storage capacitors
from input supply during power start up and
keeps refreshing the storage voltage at a
regulated value during normal operation. The
MP6302 continuously monitors the input
voltage. Once the input voltage is lower than a
selected release voltage as in the case of
losing input power, it releases the charge from
the storage capacitors to input side, and keeps
the input voltage regulated to the release
voltage for as long as possible. This allows the
system to respond to input power failure.
Start-up
During power start-up, there are two periods to
charge the storage voltage. In the first period,
the MP6302 pre-charges the large storage
capacitors from 0 to VIN with built-in inrush
current limit. Once the storage voltage is close
to the input voltage, an internal boost circuitry
will continuously charge and regulate the
storage capacitors to the target voltage. The
BST pin of MP6302 should connect to the
DCDC switch node. Figure1 shows the
charging process of MP6302.
VIN
EN of DC/DC
Output of DCDC
Storage Voltage
VIN
Storage Power Good Indicator
When the voltage on FB1 pin is lower than
0.85XVFB1, the PGs pin will be internally pulled
low. When the FB1 is above 0.9XVFB1, this pin
can be driven to the high logic.
Storage Voltage
After the start up period of MP6302, the storage
voltage can automatically regulated at a
selected output voltage. With the hysteretic
mechanism, when the storage voltage is lower
than selected voltage, an internal controlled
switch is turned on and charges the storage
capacitor. Once the storage voltage is charged
up, the switch turns off and waits for the next
refresh cycle.
Release
The MP6302 keeps monitoring the input voltage.
Once the input voltage is lower than the
selected release voltage as in the case of losing
input power, the MP6302 moves the charge
from high voltage storage capacitor to low input
voltage capacitor through an internal controlled
release path. MP6302 must charge Vs up till
PGs rises to high before a release can be
executed. The release voltage can be
determined by choosing appropriate input
resistance divider. The maximum release
current can be as high as 2.5A. The release
process is shown in Figure2.
Vstorage
VIN
Target storage voltage
Vrelease
Pre-Charge w/ current limit
Figure 1—Timing of Charging
Input UVLO of DC/DC converter
GASP
t
Figure 2—Timing of Releasing
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
Input Power Good Indicator
When the FB2 voltage, feedback voltage for the
input power, is higher than 1.05XVFB2, the PGIN
pin can be pulled up to high logic. Connect a
resistor across VIN and PGIN can drive PGIN
high. When the FB voltage is lower than
1.00XVFB2, the PGIN voltage will be internally
pulled low.
VMAX
BST
C u rre n t
L im it
Charge /
Release
Circuitry
C strg
A u to R e frsh
STR G
V IN
FB 2
Logic Control
P G IN
FB 1
PGS
GN D
Figure 3—Functional Block Diagram
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
APPLICATION INFORMATION
VIN
Setting the Storage Voltage
The storage voltage can be set by choosing
appropriate external feedback resistors R1 and
R2 which is shown in Figure 4.
R3
FB2
Cin
R4
Vstorage
STRG
R1
FB1
Cstorage
Figure 5—Feedback Circuit for Realease
Voltage
The release voltage can be calculatedt by:
R2
VRELEASE = (1 +
Figure 4—Feedback Circuit for Storage
Voltage
The storage voltage can be calculated by:
VSTORAGE = (1 +
R1
) × VFB1
R2
For example, if the storage voltage is set to be
8.5V, choose R2 to be 100kΩ, R1 will be then
given by:
R1 =
100kΩ × (8.5V − 1V)
= 750kΩ
1V
Table 1 lists the recommended resistors for
different storage voltage settings.
Table 1—Resistor Selection for Different
Storage Voltages
VSTORAGE (V)
8.5
12
15
R1 (kΩ)
750
750
750
R2 (kΩ)
100
68
53.6
Setting the Release Voltage and Input
Capacitors Selection
The release voltage can be set by external
feedback resistors R3 and R4 shown in Figure
5.
MP6302 Rev. 1.02
7/17/2015
Cf
R3
) × VFB2
R4
The selection of R3 and R4 not only determines
the release voltage, but also impacts the
stability of the release circuit. The 300kΩ500kΩ R3 and a 47μF CIN are recommended.
Table 2 lists the recommended resistors for
different release voltage settings. A 15pF feedforward capacitor is recommended for good
release dynamic performance.
Table 2—Resistor and Capacitors Selection
for Different Release Voltages
VRELEASE
(V)
11
10.2
4.2
R3 (kΩ)
R4 (kΩ)
Cf (pF)
CIN (μF)
475
464
324
47.5
49.9
100
15
15
15
47
47
47
Storage Capacitor Selection
The storage capacitor is used for energy
storage during normal operation and the energy
will be released to VIN in case of losing input
power. Usually, the small ceramic capacitors or
poscap can be used based on different
applications.
The voltage rating of storage capacitor needs to
be higher than the targeted storage voltage.
The voltage rating of storage capacitor can be
fully utilized since the voltage of storage
capacitor is very stable during normal operation.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
The necessary storage capacitance can be
estimated by:
I
×T
Cs = RELEASE HOLD
VSTORAGE − VRELEASE
Here, IRELEASE : release current
VRELEASE : release voltage
THOLD : Hold up time
VSTORAGE : voltage on CSTORAGE
For example, if IRELEASE=0.5A, THOLD=20ms,
VSTORAGE=8.5V, VRELEASE=4.2V the needed
storage capacitance is around 2200μF.
PCB Layout Guide
PCB layout is important to achieve good
performance operation for MP6302. Follow
guidelines below and use the EVB board layout
as a reference.
1) Connect the BST pin as close as possible to
the SW node of DCDC converter through a
resistor and a small ceramic capacitor. Try
to avoid interconnect the feedback path.
2) Ensure all feedback connections are short
and direct. Place the feedback resistors and
compensation components as close to the
chip as possible.
3) Keep the connection of the storage
capacitors and STRG pin as short and wide
as possible.
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
TYPICAL APPLICATION CIRCUITS
Figure 6—MP6302 Application Circuit
MP6302 Rev. 1.02
7/17/2015
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© 2015 MPS. All Rights Reserved.
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MP6302 – ENERGY STORAGE AND RELEASE CONTROL IC
PACKAGE INFORMATION
QFN10 (2x3mm)
PIN 1 ID
MARKING
0.40
0.60
1.90
2.10
10
PIN 1 ID
0.25X45º TYP.
1
0.20
0.30
2.90
3.10
PIN 1 ID
INDEX AREA
1.50
1.70
0.50
BSC
6
5
0.30
0.50
TOP VIEW
BOTTOM VIEW
0.80
1.00
0.20 REF
0.00
0.05
SIDE VIEW
NOTE:
1.90
0.60
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE0.10 MILLIMETER MAX.
4) JEDEC REFERENCE DRAWING IS JEDEC MO-220
5) DRAWING IS NOT TO SCALE.
0.25
1.70
0.50
0.70
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP6302 Rev. 1.02
7/17/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
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